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Sample (index)
Bit #
0
1
2
3
4
5
6
7
Taking advantage of the "zero" components of the midamble sequence, we get the
following equations from the basic correlation equations, so that a complex output is
calculated for each complex input, requiring half the MAC operations:
FR n ( )
=
FI n ( )
=
MOTOROLA
Table 12-8 Non-Oversampled Data Sequence
Received
Input
0
DR(0)
1
DR(1)
2
DR(2)
3
DR(3)
4
DR(4)
5
DR(5)
6
DR(6)
7
DR(7)
N 2 ⁄ 1
–
∑
(
( ) DR n 2i
⋅
(
HR 2i
i
=
0
N 2 ⁄ 1
–
∑
(
( ) DI n
⋅
(
HR 2i
i
=
0
DSP56305 User's Manual
Received
Midamble
Quadrature
DI(0)
DI(1)
DI(2)
DI(3)
DI(4)
DI(5)
DI(6)
DI(7)
)
)
(
(
) DI n
+
+
HI 2i
+
1
)
)
(
(
) DR n
⋅
+
2i
–
HI 2i
+
1
Filter Co-Processor
Operation Modes
Midamble
Input
Quadrature
HR(0)
0
0
HI(1)
HR(2)
0
0
HI(3)
HR(4)
0
0
HI(5)
HR(6)
0
0
HI(7)
⋅
(
)
)
+
2i
+
1
(
)
)
+
2i
+
1
12-35
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